Determine the structure from the FTIR and mass spectrum. The proton NMR has a singlet with an integration of 6 hydrogens at 2.6 ppm, a triplet with an integration of 1 hydrogen at 7.41 ppm, and a doublet with an integration of 3 hydrogens at 7.25 ppm.

1.  1H-NMR spectrum of 1,3-propanediol (HO-CH2-CH2-CH2-OH) shows a quintet at 1.81 ppm, a singlet at 2.75 pm, and a triplet at 3.83 ppm. Assign each signal to the protons it corresponds to in the molecule. Explain the splitting pattern observed for each signal.

Propose a structure that is consistent with the following 1H NMR spectra. In each case, the molecular formula is provided. For spectra with numbers at the bottom of the signal you will need to determine the integration, others with numbers above the signal integration has been determined for you.

Identify all proton environments and predict the chemical shift, multiplicity, coupling constants, observed integration, and number of hydrogens for each environment.

The following MS spectrum is for a compound which contains one oxygen atom (as well as C and H, of course, but no other atoms). Propose a structure which is consistent with this MS; also identify the species responsible for each peak whose numerical m/z is given (remember resonance!). OP ALTAOSACO b d 100 80 60 40 20 0 0 20 31 40 60 m/z 77 80 91 % (M+1)/M = 7.93 100 107 108 120